No, Carey. Forcing therapy on someone is pointless. Giving them an opportunity to do it, is different. A parent may have consequences in place if the child is non-compliant - let the child also choose the consequences - loss of car, tv, computer, something they want to keep. If it doesn't work - in most cases, it won't, then give them some options - in writing, and have them sign it. One of those options could be going to live with grandma, let them know you have been considering sending them to a boarding school. Problem is parents will keep giving chance after chance, and not following through with the consequences. What does that tell them about life and rules in general?
Rebuilding communication, if it's still controllable, is always key. Threats don't work, the teen has to understand there are consequences to skipping school, breaking curfew, or what would be considering "testing the waters."
It can go way beyond normal stuff quickly. ADDers are a high risk behavior personality and self-medicating, running away, unprotected sex, anger don't respond to consequences unless there's consistency and a responsiblity on their part to change their behavior.
If the teen is unwilling to work with a therapist, then I'm saying that more drastic measures may be warranted. Sending them to an overnight juvenile justice center stay, a short term program of some type, or if that doesn't work, a long term treatment center.